CN111494064A - Assembled cervical vertebra interbody fusion cage - Google Patents

Abstract

The invention discloses a matched stack type cervical vertebra interbody fusion cage, belonging to the field of spine fusion instruments. The support comprises an I-shaped support member and a side wall connecting member, wherein the I-shaped support member is used for providing a support function and comprises a first support rod, a second support rod and a longitudinal connecting rod, the two ends of the first support rod are respectively provided with the first connecting member, and the two ends of the second support rod are respectively provided with the second connecting member; the two ends of the longitudinal connecting rod are respectively connected with the first supporting rod and the second supporting rod into a whole, and the I-shaped supporting piece formed by the first supporting rod, the longitudinal connecting rod and the second supporting rod is I-shaped. The practical application result shows that based on the new structural design, the uncinate vertebral joint bone grafting can be realized, the fusion rate can be effectively improved, the bone grafting side uncinate vertebral joint fusion rate is higher than the bone non-grafting side uncinate vertebral joint fusion rate, and the method has obvious progress significance. Meanwhile, based on the improvement of the structure, corresponding selection can be carried out aiming at different patients so as to ensure the optimal clinical effect and the maximum fusion.

Description

Assembled cervical vertebra interbody fusion cage

Technical Field

The invention relates to the field of medical instruments, in particular to the field of spinal fusion instruments, and particularly relates to a combined cervical interbody fusion cage.

Background

Spinal fusion techniques have been used for decades to treat a variety of spinal disorders. Initial fusion techniques included extensive muscle release, autologous bone grafting, and long-term traction table fixation. Since the development of the internal spinal fixation technology, the success rate of spinal fusion is improved, the recovery time of a patient is shortened, and more selection spaces are left for surgical treatment. In order to reduce the failure rate of the internal fixation operation of the simple posterior spinal fusion, the concept of spinal anterior column support fusion is gradually developed at present. At first, the bone is transplanted in the intervertebral space through the anterior and posterior ways, so as to better improve the blood supply of the affected part, bear load and maintain the physiological curve of the spine. However, the bone graft as a single support does not provide sufficient robustness to the spine. The spine is fused only anteriorly and posteriorly, which may cause bone fracture and pseudoarthrosis, and the intervertebral fusion cage can avoid the above complications such as titanium mesh and rectangular carbon fiber fusion cage.

Badgy and Kusli-ch have pioneered the technology of a single interbody fusion cage. Badgy and Kusli-ch designed an interbody cage suitable for use in humans in 1986, the BAK (Bagby and Kuslich) system, and were used to treat degenerative lower back pain. These techniques are based in part on the practical experience of Badgy originally using a single cylindrical metal mesh secured to the cervical spine of a horse. Theoretically, the interbody cage maintains the stability of each fused segment through the action of the surrounding muscle contraction and the surrounding ligament tension. Since the birth of intervertebral fusion cage, people have conducted a lot of research and development.

Chinese patent application CN201922306545.6 discloses an intervertebral fusion cage with adjustable height and a matched tool thereof, the intervertebral fusion cage comprises a fusion cage body, a bone grafting cavity is arranged in the fusion cage body, the fusion cage body comprises an upper end plate, a lower end plate, an auxiliary supporting block, a main supporting block and an adjusting screw, a through bone grafting window is arranged on the upper end plate and/or the lower end plate, the bone grafting window is communicated with the bone grafting cavity, the main supporting block is connected with the upper end plate and the lower end plate through an inclined plane sliding block mechanism, one side of the auxiliary supporting block is abutted against the upper end plate and/or the lower end plate, a through connecting hole is arranged in the middle of the auxiliary supporting block, a transverse through screw hole is arranged on the main supporting block, the adjusting screw passes through the connecting hole and is in threaded connection with the screw hole, one end of the adjusting screw far away from the screw hole is provided with a transmission groove, a through bone grafting hole is arranged in the middle of, the bone grafting hole is communicated with the bone grafting cavity through a screw hole.

Chinese patent application CN201922305638.7 discloses a slidingtype can strut interbody fusion cage and kit thereof, this interbody fusion cage include the fusion cage body and strut the piece, the fusion cage body includes connecting portion and inflation portion, be equipped with the regulation hole that link up on the connecting portion, inflation portion including all with last clamp body and lower clamp body that connecting portion are connected, go up and be equipped with the regulation passageway between clamp body and the lower clamp body, upward be equipped with the bone grafting window that link up on clamp body and/or the lower clamp body, the regulation hole with adjust the passageway intercommunication, be equipped with a plurality of self-locking groove on the regulation passageway, strut the piece and be in adjust the passageway and slide and by last clamp body and lower clamp body locking in the self-locking groove, strut the piece and be equipped with the screw, the screw passes through adjust the passageway with adjust the hole intercommunication.

Chinese patent application CN201911211904.8 discloses an interbody fusion cage, which comprises a fusion cage body, wherein the fusion cage body comprises a fixing plate and a supporting block, the fixing plate is connected to one end of the supporting block and is integrally formed with the supporting block, a plurality of fixing through holes for connecting fixing screws for fixing are arranged on the fixing plate, and a connecting groove is arranged in each fixing through hole and is rotatably connected with a C-shaped ring through the connecting groove; the supporting block is provided with a supporting through hole which transversely penetrates through the supporting block, and the side surface of the supporting block and the inner side wall of the supporting through hole are both provided with mesh structures.

Chinese patent application CN201911122239.5 discloses an interbody fusion cage, it includes the axis body, first piece and the fusion of strutting, first piece of strutting is installed on the axis body and can be followed the axial displacement of axis body, first piece of strutting has the inner and the outer end that radially distributes along the axis body, inner and shaft body coupling, the fusion sets up around axis body circumference, and be connected with the first outer end of strutting, first slide has been seted up on the inner wall of fusion, be equipped with the contained angle between the extending direction of first slide and the outer wall of fusion, the outer end activity of first piece of strutting is located in first slide.

Chinese patent application CN201910937467.1 discloses an expandable intervertebral fusion cage, which comprises an integrated fusion cage body, the fusion cage body comprises: the first pressing part is provided with a first through hole, the side surface of the first pressing part is provided with a first guide groove, the plate surface of the first pressing part is provided with a first positioning tooth, and the inner plate surface is provided with a first guide sliding surface; the second pressing part and the first pressing part are of symmetrical structures; the mounting part is fixedly connected with one ends of the first pressing part and the second pressing part, and the other ends of the first pressing part and the second pressing part are free ends; the mounting part is provided with a mounting through hole; the opening block is slidably arranged between the first pressing part and the second pressing part and is abutted against the first guide sliding surface and the second guide sliding surface.

Chinese patent application CN201510541160.1 discloses a cervical vertebra uncinate vertebral joint fusion cage, it includes uncinate vertebral joint fusion part and centrum elasticity support body, and the cross section of elasticity support body between the centrum is trapezoidal, and the front end is the tip, and uncinate vertebral joint fusion part has two, connects respectively on two waist lateral surfaces of elasticity support body between the centrum, and uncinate vertebral joint fusion part is cylinder network structure, and the side that uncinate vertebral joint bone grafting fusion part kept away from centrum elasticity support body is connected with the baffle.

In summary, the prior art discloses intervertebral fusion devices with various structures, but how to further improve the intervertebral fusion device to improve the treatment effect of patients and reduce the cost of instruments is still a problem to be solved urgently. Therefore, the inventor of the application develops a combined cervical vertebra interbody fusion cage with a brand-new structure based on years of medical practice and research and exploration on the interbody fusion cage.

Disclosure of Invention

The invention aims to: aiming at the problems, the assembled cervical vertebra interbody fusion cage is provided. The practical application result shows that based on the new structural design, the uncinate vertebral joint bone grafting can be realized, the fusion rate can be effectively improved, the bone grafting side uncinate vertebral joint fusion rate is higher than the bone non-grafting side uncinate vertebral joint fusion rate, and the method has obvious progress significance. Meanwhile, based on the improvement of the structure, corresponding selection can be carried out aiming at different patients so as to ensure the optimal clinical effect and the maximum fusion.

In order to achieve the purpose, the invention adopts the following technical scheme:

the assembled cervical vertebra interbody fusion cage comprises an I-shaped support piece and side wall connecting pieces, wherein the I-shaped support piece is used for providing a support function and comprises a first support rod, a second support rod and a longitudinal connecting rod, the two ends of the first support rod are respectively provided with a first connecting piece, and the two ends of the second support rod are respectively provided with a second connecting piece;

the two ends of the longitudinal connecting rod are respectively connected with the first supporting rod and the second supporting rod into a whole, and an I-shaped supporting piece formed by the first supporting rod, the longitudinal connecting rod and the second supporting rod is I-shaped;

the cross section of the side wall connecting piece along the horizontal direction is C-shaped; one end of the side wall connecting piece is provided with a third connecting piece matched with the first connecting piece, the other end of the side wall connecting piece is provided with a fourth connecting piece matched with the second connecting piece, and the side wall connecting piece is detachably connected with the I-shaped supporting piece through the third connecting piece and the fourth connecting piece at the two ends of the side wall connecting piece;

a bone grafting cavity is formed between the I-shaped supporting piece and the side wall connecting piece.

The third connecting piece and the fourth connecting piece can limit the side wall connecting piece and the I-shaped supporting piece in the horizontal direction and ensure that the side wall connecting piece and the I-shaped supporting piece are connected in the horizontal direction.

The first connecting piece is a clamping groove, and the third connecting piece is a clamping groove bulge matched with the clamping groove;

or the first connecting piece is a clamping protrusion, and the third connecting piece is a clamping groove matched with the clamping groove protrusion.

The second connecting piece is a clamping groove, and the fourth connecting piece is a clamping groove bulge matched with the clamping groove;

or the second connecting piece is a clamping protrusion, and the fourth connecting piece is a clamping groove matched with the clamping groove protrusion.

The first support rod, the longitudinal connecting rod and the second support rod are integrally formed.

And anti-skidding structures are respectively arranged on the upper surface and the lower surface of the I-shaped supporting piece.

The anti-slip structure is a plurality of inverted teeth.

The lateral wall connecting piece comprises a lateral wall rod body, a third connecting piece and a fourth connecting piece, wherein the third connecting piece and the fourth connecting piece are respectively arranged at two ends of the lateral wall rod body, and the third connecting piece, the lateral wall rod body and the fourth connecting piece are sequentially connected into a whole.

The side wall rod body is C-shaped.

The side wall rod body adopts an equal diameter design or a reducing design along the horizontal direction.

When the side wall rod body adopts the equal-diameter design, the side wall rod body is arc-shaped;

when the side wall rod body adopts the reducing design, the side wall rod body is in a structural design with a thin middle and thick two sides.

The lateral wall rod body comprises an intermediate portion and a lateral connecting portion, the lateral connecting portion are a group, the third connecting piece, the lateral connecting portion, the intermediate portion, the lateral connecting portion and the fourth connecting piece are sequentially connected into a whole, and the intermediate portion is linear or arc-shaped.

The blood drainage device is characterized in that a connecting channel is arranged on the longitudinal connecting rod, a first channel is arranged on the first supporting rod, a second channel is arranged on the second supporting rod, the first channel on the first supporting rod, the connecting channel on the longitudinal connecting rod and the second channel on the second supporting rod are communicated in sequence, and blood on the first supporting rod, which is close to the inner side of the vertebral canal, can be drained through the first channel, the connecting channel and the second channel in sequence.

The first channel, the connecting channel and the second channel are grooves or holes respectively.

The connecting channel is arranged in the middle of the longitudinal connecting rod, the longitudinal connecting rod is of a hollow structure, the first channel and the second channel are holes respectively, and the first channel, the connecting channel and the second channel are communicated in sequence;

or the connecting channel is a groove arranged on the upper end surface or the lower end surface of the longitudinal connecting rod, the first channel and the second channel are respectively grooves matched with the connecting channel, and the first channel, the connecting channel and the second channel are sequentially communicated.

The thickness of the side wall connecting piece along the vertical direction adopts an equal-thickness design;

or the thickness of the side wall connecting piece along the vertical direction adopts a gradual change design, and the thickness of one side of the side wall connecting piece close to the second supporting rod gradually decreases towards the thickness of one side of the side wall connecting piece close to the first supporting rod.

And the lower end surface of the side wall connecting piece gradually rises relative to the horizontal plane and the thickness of the side wall connecting piece gradually decreases progressively along the direction of the second supporting rod towards the first supporting rod, and the upper end surface and the lower end surface of the side wall connecting piece can be respectively attached to the bone surface of the vertebral body.

Plant the up end in bone cavity, be provided with respectively to the lower terminal surface and prevent that the broken bone from the sealing layer of planting the landing in the bone cavity, the sealing layer can avoid the bone grain to lose and fall in the spinal canal or around neural and avoid oppressing the spinal cord nerve for network structure and sealing layer.

The sealing layer is respectively connected with the upper end and the lower end of the I-shaped supporting piece;

or the closed layer is respectively connected with the upper end and the lower end of the opening side of the side wall connecting piece.

Preferably, the closed layer is respectively connected with the upper end and the lower end of the I-shaped supporting piece, and the opening side of the side wall connecting piece is provided with a connecting groove matched with the closed layer;

or the closed layer is respectively connected with the upper end and the lower end of the opening side of the side wall connecting piece, and the I-shaped supporting piece is provided with a connecting groove matched with the closed layer.

FIG. 8 is a schematic view of an existing intervertebral cage; the middle part of the structure is provided with a bone grafting cavity, four sides of the bone grafting cavity all play a supporting role, and particularly, supporting walls playing a supporting role are respectively arranged on two sides of the bone grafting cavity along the inserting direction of the intervertebral fusion cage. Therefore, the application carries out brand new design on the vertebral body structure. The utility model discloses a cervical vertebra interbody fusion cage adopts detachable structural design, and it includes I shape support piece, lateral wall connecting piece. The I-shaped supporting piece comprises a first supporting rod, a second supporting rod and a longitudinal connecting rod, wherein two ends of the longitudinal connecting rod are respectively connected with the first supporting rod and the second supporting rod into a whole, and the formed I-shaped supporting piece is I-shaped as shown in figure 2. The first support rod and the second support rod can adopt a linear or curved structural design; for simplifying the drawings, the applicant is shown in fig. 2 as a straight line, but the applicant does not limit the first support bar and the second support bar in the present application. Preferably, the first support rod, the longitudinal connecting rod and the second support rod are integrally formed.

In the application, the section of lateral wall connecting piece along the horizontal direction is the C style of calligraphy, and lateral wall connecting piece is two, can dismantle the connection with the left and right both ends of I shape support piece respectively (along the direction of inserting of cervical vertebra interbody fusion cage), constitutes between I shape support piece and the lateral wall connecting piece and plants the bone chamber. In the application, the I-shaped supporting piece is detachably connected with the side wall connecting piece; according to different surgical uncinate joints, corresponding side wall connecting pieces can be selected to be matched. Wherein, two ends of the first support rod are respectively provided with a first connecting piece, and two ends of the second support rod are respectively provided with a second connecting piece; one end of the side wall connecting piece is provided with a third connecting piece matched with the first connecting piece, and the other end of the side wall connecting piece is provided with a fourth connecting piece matched with the second connecting piece; the side wall connecting piece is detachably connected with the I-shaped supporting piece through a third connecting piece and a fourth connecting piece at two ends of the side wall connecting piece. In the structure, the first connecting piece is a clamping groove, and the third connecting piece is a clamping groove bulge matched with the clamping groove; or the first connecting piece is a clamping protrusion, and the third connecting piece is a clamping groove matched with the clamping groove protrusion. Preferably, the second connecting piece is a clamping groove, and the fourth connecting piece is a clamping groove bulge matched with the clamping groove; or the second connecting piece is a clamping protrusion, and the fourth connecting piece is a clamping groove matched with the clamping groove protrusion. Furthermore, the third connecting piece and the fourth connecting piece can limit the side wall connecting piece and the I-shaped supporting piece in the horizontal direction and ensure that the side wall connecting piece and the I-shaped supporting piece are connected in the horizontal direction; in the application, along the insertion direction of the cervical interbody fusion cage, the I-shaped supporting piece and the side wall connecting piece are kept fixed relatively in the horizontal direction, and the upper end and the lower end of the cervical interbody fusion cage can realize limiting under the action of cervical vertebrae, so that the structure of the cervical interbody fusion cage can be effectively simplified, and the cost of instruments is reduced; simultaneously, because the simplification of the upper and lower end stop gear of the cervical vertebra interbody fusion cage for the bone grafting chamber can hold more broken bones, is favorable to patient's treatment.

Different from the existing design, this application adopts I shape support piece design. Along the inserting direction of the interbody fusion cage, the first supporting rod and the second supporting rod respectively play a supporting role, and the side wall connecting piece plays a connecting role between the first supporting rod and the second supporting rod. Meanwhile, the function of the side wall connecting piece is changed from supporting to connecting, and the side wall connecting piece is used for forming a bone grafting cavity between the side wall connecting piece and the I-shaped supporting piece.

Traditional intervertebral disc removal interbody bone grafting fusion emphasizes 'vertebral body fusion', namely, bone grows and heals from the centers of upper and lower vertebral bodies, but due to anatomical and physiological reasons, the distance between the upper and lower vertebral bodies is far, and other reasons such as possible blood transportation and the like, the 'creeping replacement healing process' of the bone is long and hard, and the healing time is long. Therefore, how to shorten the healing time becomes an urgent problem to be solved. Therefore, the structure of the intervertebral fusion cage is completely new designed, and the four sides of the bone grafting cavity of the existing intervertebral fusion cage are supported, so that the structure is changed into the I-shaped supporting piece; the I-shaped supporting piece is used for abdicating the uncinate vertebral joints at the two sides of the cervical vertebra, so that corresponding bone grafting can be carried out; the side wall connecting piece is matched with the I-shaped supporting piece to form a complete bone grafting cavity; only when the bone grafting cavity is formed, the method has significance for abdicating the uncinate vertebral joint. And if only a complete bone grafting cavity is formed on the I-shaped support member, the simplest way is as follows: the side wall connecting piece and the I-shaped supporting piece are fixedly connected, and an integrated design is adopted, so that the integral structure is simplified, the generation procedure is shortened, and the generation cost is correspondingly reduced. However, if the design of fixedly connecting the i-shaped supporting member and the side wall connecting member is adopted, the following defects can be caused: 1) if the height of the side wall connecting piece is reduced, the volume of a bone grafting cavity is reduced, the bone grafting amount is finally reduced, and the corresponding effect is also reduced; 2) if the height of the side wall connecting piece is increased, the cutting amount of the uncinate joint is increased in some cases, and the side wall connecting piece is not beneficial to the rehabilitation of a patient essentially; 3) for different patients, the cutting amount of the uncinate joints at two sides of the cervical vertebra is difficult to keep consistent, the cutting amount of the uncinate joints at one side is often large or completely cut, the cutting amount of the uncinate joints at the other side is relatively small or not cut, and the design of fixedly connecting the I-shaped supporting piece and the side wall connecting piece can not meet the requirement completely. Therefore, the fixed connection design is changed into a detachable structure design; the first connecting piece and the second connecting piece of the I-shaped supporting piece are fixed after being manufactured and molded and can be detachably connected with the third connecting piece and the fourth connecting piece of the side wall connecting piece; under the condition, on the premise that the third connecting piece and the fourth connecting piece are uniformly designed, the side wall connecting pieces with different heights can be designed; when in actual application, through selecting for use the lateral wall connecting piece of co-altitude not, and then realize with cervical vertebra both sides uncinate vertebral joint's pairing, satisfy corresponding requirement to guarantee to plant the completeness of bone cavity.

In practical application, aiming at the operation condition of a patient (taking the vertebral artery type cervical spondylosis caused by the hyperplasia and compression of the uncinate vertebra joints as an example, the current treatment mode opinions are not unified, the comprehensive treatment mode of the drug treatment combined rehabilitation therapy is still preferred, and the operation treatment can be adopted as appropriate after the conservative treatment is invalid, the operation treatment mode comprises a plurality of operation modes such as simple uncinate vertebra joint resection, uncinate vertebra joint resection combined transverse apophysis and the like, for some suitable cases, the operation treatment is a selectable effective treatment mode, and after the allowances and the non-resection are compared and researched, the uncinate vertebra joint resection decompression can obtain good curative effect, has certain clinical popularization value), and after a suitable side wall connecting piece is selected, forming a complete assembled cervical interbody fusion cage, and then implanting the assembled cervical interbody fusion cage. After the assembled cervical interbody fusion cage is implanted, the distraction force can ensure that the muscles, the fibrous rings, the anterior and the posterior longitudinal ligaments of the fusion segment are in a continuous tension state, so that the fusion segment and the fusion cage achieve three-dimensional super-static fixation. Meanwhile, practical application results show that based on new structural design, the uncinate vertebral joint bone grafting can be realized, the fusion rate can be effectively improved, the bone grafting side uncinate vertebral joint fusion rate is higher than the bone non-grafting side uncinate vertebral joint fusion rate, and the method has obvious progress significance.

Adopt the cervical vertebra interbody fusion cage of this application, through the height that resumes intervertebral space to the stress and the stability of the anterior, center pillar of recovery backbone, resume, maintain, stabilize the intrinsic physiology of backbone and be protruding, enlarge intervertebral foramen, alleviate the pressurized of nerve root. The recovery of intervertebral space height can indirectly refore because the losing of intervertebral space height and the fibrous ring that leads to folding ligamentum flavum and compressed to make the stenosis of central vertebral canal obtain improving obviously, increase the anterior-posterior footpath of vertebral canal, occupy-place in the original vertebral canal is alleviateed. Simultaneously, this application make full use of human cervical vertebra both sides uncinate vertebral joint adjacent near, uncinate vertebral joint department closes on the natural advantage of cervical vertebra such as soft tissue blood circulation is abundant, implants the bone and crawls the substitution distance short, grows soon, fuses the rate height. Meanwhile, based on the matched stack design of the I-shaped supporting piece and the side wall connecting piece, corresponding selection can be carried out aiming at different patients so as to ensure the optimal clinical effect (mainly realizing immediate stability and high fusion after operation and reducing the incidence rate of complications) and the maximum fusion.

The upper end surface and the lower end surface of the assembled cervical interbody fusion cage are respectively provided with an anti-skidding structure; by adopting the anti-slip structure, the assembled cervical interbody fusion cage can be firmly connected with the vertebral body to prevent the assembled cervical interbody fusion cage from slipping from the vertebral body. Furthermore, along the insertion direction of the cervical interbody fusion cage, anti-skid structures are respectively arranged on the upper surface and the lower surface of the I-shaped support piece; preferably, the anti-slip structure may be a plurality of inverted teeth.

In this application, the lateral wall connecting piece includes the lateral wall body of rod, third connecting piece, fourth connecting piece, and third connecting piece, fourth connecting piece set up respectively at the both ends of the lateral wall body of rod and third connecting piece, the lateral wall body of rod, fourth connecting piece link to each other as an organic whole in proper order, and the lateral wall body of rod is the C style of calligraphy. Further, the side wall rod body adopts an equal diameter design or a reducing design; preferably, when the sidewall rod body adopts the equal-diameter design, the sidewall rod body is arc-shaped; when the side wall body of rod adopts the reducing design, the side wall body of rod is the thin both sides thick structural design in the middle of (in this application, because the main effect of lateral wall connecting piece lies in constituting the bone grafting chamber, therefore more play the effect of the broken bone external falling in the restriction bone grafting chamber of itself, therefore adopt the reducing design to be feasible). As a variation, the sidewall rod includes a middle portion and a lateral connecting portion, the lateral connecting portions are a group, the third connecting member, the lateral connecting portion, the middle portion, the lateral connecting portion, and the fourth connecting member are connected in sequence, and the middle portion is linear (as shown in fig. 7) or arc-shaped.

Present cervical vertebra interbody fusion cage structure is comparatively narrow, and it is when using, and blood can be followed cervical vertebra interbody fusion cage's both sides and oozed or flow, and this application both sides broad, under the prerequisite of bone volume is planted in the promotion, blood just is difficult to flow from fusion cage both sides, for this reason, this application improves the structure to under the prerequisite of bone volume is planted in the promotion, realize the drainage operation, avoid forming hematoma, oppression spinal cord nerve.

In this application, be provided with the interface channel on the vertical connecting rod, first bracing piece is provided with first passageway, is provided with the second passageway on the second bracing piece, and first passageway on the first bracing piece, interface channel on the vertical connecting rod, the second passageway on the second bracing piece communicate in proper order and be close to the blood of canalis spinalis inboard on the first bracing piece and can be in proper order through first passageway, interface channel, second passageway drainage. In this application, the first channel, the connecting channel, and the second channel are respectively designed to have a groove or a hole. Furthermore, the connecting channel is arranged in the middle of the longitudinal connecting rod, the longitudinal connecting rod is of a hollow structure and corresponds to the connecting channel, the first channel and the second channel are respectively of a hole-opening structure, and the first channel, the connecting channel and the second channel are sequentially communicated; or the connecting channel adopts a groove design, the connecting channel is arranged on the upper end surface or the lower end surface of the longitudinal connecting rod and corresponds to the upper end surface or the lower end surface of the longitudinal connecting rod, the first channel and the second channel respectively adopt a groove design matched with the connecting channel, the working surface of the first supporting rod is positioned on one side of the assembled cervical vertebra interbody fusion cage close to the vertebral canal, a plurality of grooves are arranged on the working surface, and blood can be drained through the grooves on the first supporting rod, the connecting channel of the longitudinal connecting rod and the second channel on the second supporting rod. Adopt this structure, first passageway on the first bracing piece cooperatees with patient's spinal canal, first passageway and patient's spinal canal, incision intercommunication promptly. After the operation decompression, probably a small amount of oozing blood in the canalis spinalis adopts this structure, the drainage in the canalis spinalis of being convenient for, and can observe the drainage volume simultaneously, avoids the intraductal hematoma oppression spinal cord of vertebra because of the unobstructed institute of drainage arouses, the paralysed problem appears. Meanwhile, the grooves are formed in the direction close to the vertebral canal (namely, the first channel on the first supporting rod adopts a plurality of grooves) and are communicated with the hollow channel of the longitudinal connecting rod, and drainage is facilitated. As an alternative, the connecting channel is arranged on the upper or lower end face of the longitudinal link.

Meanwhile, in the application, the first supporting rod is arranged on one side close to the vertebral canal, and the second supporting rod is arranged on one side far away from the vertebral canal. Meanwhile, the side wall connecting piece adopts an equal-thickness design or a gradual change design; when the thickness of the side wall connecting piece along the vertical direction is designed in a gradual change mode, the thickness of one side, close to the second supporting rod, of the side wall connecting piece is gradually reduced towards the thickness of one side, close to the first supporting rod, of the side wall connecting piece. Preferably, along the direction of second bracing piece towards first bracing piece, the lower terminal surface of lateral wall connecting piece rises gradually and the thickness of lateral wall connecting piece is steadilyd decrease gradually relatively the horizontal plane, and then can make the up end of lateral wall connecting piece, lower terminal surface can closely laminate with the bone surface of centrum respectively.

Furthermore, the I-shaped supporting piece and the side wall connecting piece are respectively prepared from one or more of polyether-ether-ketone, polylactic acid (P L A), Amino Acid Copolymer (AACP) and the like, wherein the elastic modulus of the polyether-ether-ketone is close to that of cortical bone, the biocompatibility is good, the strength and the fatigue resistance of the polyether-ether-ketone are equivalent to those of metal materials, artifacts can not be generated through X-ray examination and MRI or CT examination, P L A is a white semi-crystal, the melting point is 175-185 ℃, the tensile strength is 40-60 MPa, the elastic modulus is 3-4 GPa, the AACP is a novel degradable medical high polymer material and is composed of 6-aminocaproic acid, glycine, proline, alanine, phenylalanine and the like, and when the polylactic acid and the AACP are used in the application, the prepared assembled cervical vertebra fusion cage is an absorbable cervical vertebra fusion cage.

The method comprises the steps of preparing a closed layer, a connecting layer and a rigid material, wherein the closed layer is made of a rigid material, the rigid material is used for forming a connection groove, the rigid material is used for forming a connection part, the rigid material is used for forming a connection groove, the flexible material is used for forming a connection groove, the rigid material is used for forming a connection groove, the connection part, the rigid material is used for forming a connection groove, the rigid material is used for forming a connection groove, the flexible connection part is used for forming a connection groove, the flexible connection part, the flexible connection groove is used for forming a connection groove, the flexible connection part is used for forming a connection groove, the flexible connection groove, the flexible connection part, the flexible connection groove is used for forming a connection groove, the connection groove is used for forming a connection part, the connection part is used for forming a connection part, the flexible connection part, the connection part is used for forming a connection groove, the connection part, the connection groove, the flexible connection groove, the connection part is used for forming a connection part, the connection groove, the connection part is used for forming a connection part, the connection groove.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of the assembled cervical interbody cage of example 1.

FIG. 2 is a schematic structural view of the I-shaped supporting member shown in FIG. 1.

Fig. 3 is a schematic perspective view of fig. 1.

Fig. 4 is a rear view of fig. 3.

Fig. 5 is a schematic structural view of the tapered sidewall connector of fig. 1.

Fig. 6 is a schematic view of the constant diameter sidewall connector based on fig. 4.

FIG. 7 is a schematic diagram of a variation of the variable diameter sidewall connector of FIG. 5.

Fig. 8 is a schematic structural view of a conventional intervertebral cage.

The labels in the figure are: 1. the support structure comprises I-shaped support members, 2, side wall connecting pieces, 3, first supporting rods, 4, second supporting rods, 5, longitudinal connecting rods, 6, first connecting pieces, 7, second connecting pieces, 8, third connecting pieces, 9, fourth connecting pieces, 10, side wall rod bodies, 11, middle parts, 12, side connecting parts, 20, first channels, 21, connecting channels, 22 and second channels.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

Example 1

The cervical interbody fusion cage of the embodiment comprises an I-shaped support member and a side wall connecting member; wherein, the I-shaped supporting piece mainly plays a supporting function, and the side wall connecting piece is mainly used for forming a bone grafting cavity. In this embodiment, the i-shaped supporting member includes a first supporting rod, a second supporting rod, and a longitudinal connecting rod, two ends of the longitudinal connecting rod are respectively connected with the first supporting rod and the second supporting rod as a whole, and the first supporting rod, the longitudinal connecting rod and the second supporting rod are connected to form an i-shape. In order to simplify the drawing, the applicant has represented in fig. 2 the straight line type; in practical application, the shapes and the lengths of the first supporting rod and the second supporting rod can be correspondingly changed according to practical requirements. Preferably, the first support rod, the longitudinal connecting rod and the second support rod are integrally formed.

As shown in figure 1, the side wall connecting pieces are in a group, the section of the side wall connecting pieces along the horizontal direction is in a C shape, and a bone grafting cavity is formed between the I-shaped supporting piece and the side wall connecting pieces. Meanwhile, two ends of the first support rod are respectively provided with a first connecting piece, and two ends of the second support rod are respectively provided with a second connecting piece; one end of the side wall connecting piece is provided with a third connecting piece matched with the first connecting piece, the other end of the side wall connecting piece is provided with a fourth connecting piece matched with the second connecting piece, and the side wall connecting piece is detachably connected with the I-shaped supporting piece through the third connecting piece and the fourth connecting piece at the two ends of the side wall connecting piece. Wherein, first connecting piece, second connecting piece are the joint recess respectively (the joint recess sets up along vertical direction for the draw-in groove arch can be along vertical direction joint in the joint recess, and third connecting piece, fourth connecting piece are respectively with joint recess matched with draw-in groove protruding. In this embodiment, the sidewall connecting member includes a sidewall rod, a third connecting member and a fourth connecting member, the third connecting member and the fourth connecting member are respectively disposed at two ends of the sidewall rod, and the third connecting member, the sidewall rod and the fourth connecting member are sequentially connected to form a whole, and the sidewall rod is C-shaped. In the embodiment, the side wall rod body adopts a reducing design, specifically, the middle of the side wall rod body is thin, and the two sides of the side wall rod body are thick, and the wall thickness of the side wall rod body is uniformly increased from the minimum value in the middle to the two sides; the width of the narrowest part in the middle of the side wall rod body is 1/20-5/6 of the width of the first supporting rod. In the embodiment, the wall thickness and the height of the side wall connecting piece can be set according to requirements, so that a plurality of groups of side wall connecting pieces are formed; during the actual operation, corresponding selection can be carried out according to the actual condition of the patient.

As shown in fig. 1 and 2 (in fig. 1 and 2, for convenience of viewing, the first channel, the connecting channel, and the second channel are indicated by dotted lines), the connecting channel is disposed on the longitudinal connecting rod, the first channel is disposed on the first supporting rod, the second channel is disposed on the second supporting rod, and the first channel on the first supporting rod, the connecting channel on the longitudinal connecting rod, and the second channel on the second supporting rod are sequentially communicated. In the embodiment, the I-shaped structure formed by the first support rod, the second support rod and the longitudinal connecting rod is consistent with the position of the existing fusion cage; meanwhile, the first channel, the connecting channel and the second channel are respectively of a through hole structure, the connecting channel is arranged in the middle of the longitudinal connecting rod, and the longitudinal connecting rod is of a hollow structure. Use first bracing piece for being close to one side of patient's spinal canal, the first passageway on the first bracing piece, the second passageway on connecting channel on the vertical connecting rod, the second bracing piece communicates in proper order to can let patient's spinal canal and incision intercommunication. Adopt this structure, can make first passageway and patient's canalis spinalis, incision intercommunication, and then guarantee that patient's canalis spinalis and incision are unobstructed. After the operation decompression, probably a small amount of oozing blood adopts this structure, the drainage of being convenient for, and can observe out the intraspinal blood volume simultaneously, avoids the intraspinal hematoma oppression spinal cord because of the unobstructed institute of drainage arouses, the paralysed problem appears.

As an alternative mode, the first channel, the connecting channel and the second channel of the device are designed by groove structures respectively; the connecting channel is a groove arranged on the upper end surface or the lower end surface of the longitudinal connecting rod, the first channel and the second channel are respectively grooves matched with the connecting channel, and the first channel, the connecting channel and the second channel are sequentially communicated. In concrete structure, be provided with a plurality of recess on the first passageway respectively, recess and connecting channel intercommunication on the first passageway, the recess intercommunication of connecting channel and second passageway, and then make the intraductal oozing blood of vertebra can pass through the recess on connecting channel, the second passageway through the recess on the first passageway and flow out, the intraductal drainage of the vertebra of being convenient for, and can observe the drainage volume simultaneously, avoid the intraductal hematoma oppression spinal cord of vertebra because of the unobstructed institute of drainage arouses, the paralysed problem appears.

Practical test results show that the application has the advantages of short crawl replacement distance of implanted bones, fast growth, fast fusion and high fusion rate; simultaneously, the design of the matched stack formula of I-shaped support piece and lateral wall connecting piece in this application can ensure the best clinical effect and furthest's integration.

Meanwhile, in the embodiment, the first supporting rod is arranged on one side close to the vertebral canal, and the second supporting rod is arranged on one side far away from the vertebral canal.

FIG. 6 shows a variation of FIG. 5 in which the sidewall links are of a constant diameter design; fig. 7 shows another modification of fig. 5, in which the sidewall rod includes a middle portion and a pair of lateral connecting portions, the third connecting member, the lateral connecting portions, the middle portion, the lateral connecting portions, and the fourth connecting member are connected in sequence, and the middle portion is linear. Meanwhile, in the embodiment, the thickness of the side wall connecting piece in the vertical direction is gradually changed, and the thickness of the side wall connecting piece close to the second supporting rod is gradually reduced towards the thickness of the side wall connecting piece close to the first supporting rod; adopt this structure, along the direction of second bracing piece towards first bracing piece, the relative horizontal plane of lower terminal surface of lateral wall connecting piece rises gradually and the thickness of lateral wall connecting piece is steadilyd decrease gradually, and then makes when carrying out the fusion cage and plant, the up end of lateral wall connecting piece, terminal surface can laminate with the bone face of patient's centrum respectively down. In this application, the lateral wall connecting piece adopts the design of becoming the wall thickness in vertical direction, is favorable to increasing the volume of planting the bone chamber, and it adopts the design of becoming the wall thickness in vertical direction, then is favorable to laminating mutually with the upper and lower bone face of patient's centrum. Meanwhile, the thickness of the side wall connecting piece of the embodiment along the vertical direction can also adopt an equal-thickness design.

Preferably, the I-shaped supporting member and the side wall connecting member are respectively made of polyether-ether-ketone. Furthermore, the upper end surface and the lower end surface of the assembled cervical interbody fusion cage of the embodiment are respectively provided with an anti-slip piece (in the embodiment, the anti-slip structure is a plurality of inverted teeth); by adopting the structure, when the cervical interbody fusion cage is implanted, the falling-off of the cervical interbody fusion cage can be avoided.

The intervertebral fusion cage is characterized in that the upper end surface and the lower end surface of the bone grafting cavity are respectively provided with a sealing layer, and the sealing layers are of a net structure, in the embodiment, the sealing layers are respectively connected with the upper end and the lower end of the left opening and the right opening of the I-shaped supporting piece, in the embodiment, fixing nets (namely the sealing layers of the application) for preventing bone particles from falling off are respectively manufactured on both sides of the bone grafting cavity of the intervertebral fusion cage, so that broken bones can be effectively prevented from falling off from the bone grafting cavity, meanwhile, the sealing layers of the application adopt the net structure, as long as the falling off of the bone particles can be prevented, the selection principle of materials does not influence the healing of the bones, the adoption of the structure can effectively prevent the broken bones from falling off from the bone grafting cavity, ensure the bone grafting amount, avoid the problem that the bone particles are insufficient after the falling off and influence the healing, the adoption of the sealing layers of the net structure is beneficial to the flowing of blood in the vertical direction, promote the healing of the bones, and meanwhile, the structural design of the sealing layers can prevent the bone particles from falling off and leave in or around the spinal canal or nerve compression, the intervertebral fusion cage has great significance and has great significance for promoting the cervical vertebra fusion cage before the common operation, the IF (L) and the lumbar vertebra.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims (10)

1. The assembled cervical interbody fusion cage is characterized by comprising an I-shaped support piece and side wall connecting pieces, wherein the I-shaped support piece is used for providing a support function and comprises a first support rod, a second support rod and a longitudinal connecting rod, the two ends of the first support rod are respectively provided with the first connecting pieces, and the two ends of the second support rod are respectively provided with the second connecting pieces;

the two ends of the longitudinal connecting rod are respectively connected with the first supporting rod and the second supporting rod into a whole, and an I-shaped supporting piece formed by the first supporting rod, the longitudinal connecting rod and the second supporting rod is I-shaped;

the cross section of the side wall connecting piece along the horizontal direction is C-shaped; one end of the side wall connecting piece is provided with a third connecting piece matched with the first connecting piece, the other end of the side wall connecting piece is provided with a fourth connecting piece matched with the second connecting piece, and the side wall connecting piece is detachably connected with the I-shaped supporting piece through the third connecting piece and the fourth connecting piece at the two ends of the side wall connecting piece;

a bone grafting cavity is formed between the I-shaped supporting piece and the side wall connecting piece.

2. The cervical interbody fusion cage of claim 1, wherein the first connecting member is a clamping groove, and the third connecting member is a clamping groove protrusion engaged with the clamping groove;

or the first connecting piece is a clamping protrusion, and the third connecting piece is a clamping groove matched with the clamping groove protrusion;

the second connecting piece is a clamping groove, and the fourth connecting piece is a clamping groove bulge matched with the clamping groove;

or the second connecting piece is a clamping protrusion, and the fourth connecting piece is a clamping groove matched with the clamping groove protrusion.

3. The cervical interbody fusion cage of claim 1 or 2, wherein the sidewall connecting member includes a sidewall rod, a third connecting member, and a fourth connecting member, the third connecting member and the fourth connecting member are respectively disposed at two ends of the sidewall rod, and the third connecting member, the sidewall rod, and the fourth connecting member are sequentially connected to form a whole.

4. The cervical interbody fusion cage of any one of claims 1 to 3, wherein the sidewall rods are designed to have a constant diameter or a variable diameter in a horizontal direction.

5. The cervical interbody fusion cage of any one of claims 1 to 4, wherein the longitudinal link is provided with a connecting channel, the first support rod is provided with a first channel, the second support rod is provided with a second channel, the first channel of the first support rod, the connecting channel of the longitudinal link and the second channel of the second support rod are sequentially communicated, and blood near the inner side of the vertebral canal of the first support rod can be sequentially drained through the first channel, the connecting channel and the second channel;

the first channel, the connecting channel and the second channel are grooves or holes respectively.

6. The cervical interbody fusion cage of claim 5, wherein the connecting channel is disposed at a middle portion of the longitudinal link, the longitudinal link is a hollow structure, the first channel and the second channel are holes, and the first channel, the connecting channel and the second channel are sequentially communicated;

or the connecting channel is a groove arranged on the upper end surface or the lower end surface of the longitudinal connecting rod, the first channel and the second channel are respectively grooves matched with the connecting channel, and the first channel, the connecting channel and the second channel are sequentially communicated.

7. The cervical interbody fusion cage of any one of claims 1 to 6, wherein the thickness of the sidewall connecting member in the vertical direction is of an equal thickness design;

or the thickness of the side wall connecting piece along the vertical direction adopts a gradual change design, and the thickness of one side of the side wall connecting piece close to the second supporting rod gradually decreases towards the thickness of one side of the side wall connecting piece close to the first supporting rod.

8. The cervical interbody fusion cage of claim 7, wherein, along the direction from the second support bar toward the first support bar, the lower end surface of the sidewall connector gradually rises relative to the horizontal plane and the thickness of the sidewall connector gradually decreases, and the upper end surface and the lower end surface of the sidewall connector can respectively fit with the bone surface of the vertebral body.

9. The cervical interbody fusion cage of any one of claims 1 to 8, wherein the upper and lower end surfaces of the bone grafting cavity are respectively provided with a sealing layer capable of preventing broken bones from slipping off from the bone grafting cavity, the sealing layer is of a net structure and can prevent bone particles from falling into the vertebral canal or around nerves and avoid compressing spinal nerves.

10. The cervical interbody cage of claim 9, wherein the sealing layer is connected to the upper and lower ends of the i-shaped support member, respectively;

or the closed layer is respectively connected with the upper end and the lower end of the opening side of the side wall connecting piece.

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